Physical Science Final Exam Review

Front

What is density?

Back

Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³). It determines how heavy a substance is for a given volume.

Front

How does molecular motion affect states of matter?

Back

As molecular motion increases, substances can change from solid to liquid (melting) and from liquid to gas (evaporation).

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the mass of the reactants equals the mass of the products.

Front

What is nuclear fission?

Back

Nuclear fission is a process in which the nucleus of an atom splits into two or more lighter nuclei, releasing a significant amount of energy.

Front

What is nuclear fusion?

Back

Nuclear fusion is a process in which two light atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

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What is an example of a physical change?

Back

Melting ice is an example of a physical change; the ice changes from solid to liquid but remains water (H₂O).

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change; it transforms into ash, smoke, and gases, creating new substances.

Front

What is the role of glucose in cellular respiration?

Back

Glucose is broken down in cells to produce energy (ATP) during cellular respiration, which is essential for cellular functions.

Front

What is the significance of the chemical equation in a reaction?

Back

A chemical equation represents the reactants and products in a reaction, showing the conservation of mass and the ratio of substances involved.